Fan for induced draft.



H, TOUSSAINT.

FAN FOR INDUCED DRAFT.

APPLICATION nuso JAN-25,1916.

Patented May 9, 1916.

3 SHEETSSHEETI jzqll;

l/VVE/VTOR 701/584 INT WITNESSES H. TOUSSAINT.

FAN FOR INDUCED DRAFT.

. APPLICATION FILED JAN-25,1916- L1%,63 Patented May 9,1916.

3 SHEETSSHEET 2- WITNESSES. INVENTOR' l/El/t/R/Cl/ muss/4 m/ T H.TOUSSAINT.

FAN FOR INDUCED DRAFT.

APPLICATION FILED JAN. 25. I916.

Patented May 9, 1916.

(3 SHEETS-SHEET 3- RT 0 W E4 VS ww 0 T M n H SCHMIDTSCHEHEISSDAMPF-GESELLSCHAF'I' M. B. H., 0]? CASSEL-WILHELMSHfiHE,

FAN FOR INDUCED DRAFT.

Specification of Letters Patent.

' Application filed January 25, 1916. Serial No. 74,097.

To all whom it may concern:

Be it known that I, HEINRICH TOUssAIN'r, a subject of the GermanEmperor, King of Prussia, residing at Cassel-Wrlhelmshtihe, Germany,have invented certain new and useful Improvements in Fans for InducedDraft, of whichthe following is a spec1fica tion.

My invention relates to rotatable fans, for induced draft, when placedin the lower part of a chimney or stack and operated so as to force thefire gases upwardly thereln.

'Fans placed in the lower part of a chimney or stack, as abovementioned, are not new. Such arrangements, however, have not beenentirely satisfactory, owing to the fact that the fan bearings have beenexposed, to a greater or less extent, to the intensely hot flue gases;and it has long been recognized that, to avoid the intense heat therebyproduced, said bearings should be I removed as far as possible from the1nflu-- ence of such gases. In prior arrangements, of which I haveknowledge, this object has only been partially attained, inasmuch as ithas only been possible to locate the lower or thrust bearing out of thestream of hot gases while leaving the upper or neck bearing exposedthereto.

It is the object of the present invention to improve the just describedand hitherto used arrangement by not only removing both bearings fromthe stream of hot flue gases, but by, furthermore, providing means toactually cool 'the neck hearing by flowing thereover a stream of coldair. This requirement of a stream ofcold air flowing over the neckbearing is almost as essential as that the neck hearing be removed fromthe stream of flue gases, inasmuch as the neck bearing is, in any case,substantially nearer the fan than the thrust bearing and is consequentlyaffected by the heat of the said gases in much greater degree. Over andbeyond this, a great deal of heat, from.

the region of the fan, reaches the neck bearing by conduction throughthe fan shaft.

My invention will be better understood by referring to the accompanyingdrawings,

in -which Figure 1 represents one form of my invention as applied to thechimney of, a sta tionary steam plant, the chimney being shown insection; Figs. 2 and 3 represent, respectively, front-and sideelevations of a modified form of my invention as applied to a marineboiler plant; and Figs. 1 and 1 show, respectively and on an enlargedscale, axial sections through the neck bearmg and the thrust bearing.

Referring to Fig. 1, a fan b is located near the bottom of a chimney b,and fixed to a shaft 0 which is mounted to rotate in a frame 0?, havinga neck bearing d and a thrust bearing d The frame 03 is supported bybrackets g, g and provided with a downwardly extended portion 7 carryinga motor 6, (electric or other preferred suitable type) the shaft ofwhich is directly connected at n to the shaft 0. The frame w1th itsbearings is situated, as may be seen by the drawing, in a chamber 6opening from, or recessed into, the bottom of the chimney. This chamberis covered by a plate 6 and is also provided with a lateral openinghaving a door It. The plate 11 base central opening is through whichprojects the upper part of the frame 05, with the neck bearing d, andfrom this opening is extended a tapered air conduit sleeve Z which isspaced from but surrounds the projecting portion of the frame and thatportion of shaft 0 above the frame and reaches substantially to the fanI). The door it, when opened, gives access to the fan, its mounting andmotor, as a whole for purposes of cleaning, lubrication, repair and thelike; and the door is so arranged that, even when closed, a certainamount of cold air, from outside the chimney, may pass therethrough.

In operation, the rotation of the fan forces the hot flue gasesupwardly, thereby establishing the desired induced draft and preventingsaid gases, and any ashes which they may have carried from the fire box,from entering the top of the air conduit Z so as to heat shaft 0 andneck bearing 03. Furthermore, the cold air which enters chamber 6through door h, will be sucked upwardly by the fan so as to establish acontinuously flowing stream through air conduit Z, which stream willtend to cool the neck bearing d" and the shaft 0 and, hence,

-to lessen the amount of heat which can be carried from the fan to theneck bearing by conduction through the shaft 0.

- In the modified form ofmy invention intended for marine boilers, asshown in Figs. 2 and 3, the stack in which the fan is placed is formedby the junction of the individual exit flues, g and r, of a pair ofsimilar boilers o and 1) arranged side by side in the usual way. Theframe d, carrying the neck and thrust bearings d and d, and the drivingmotor e (shown as'a steam turbine in this case), is supported in thechamber or space i, formed and laterally bounded by the flues g and 1',as they unite to form the main stack. The air conduit or sleeve 1extends upwardly from an opening made in the upper central part of thischamber.

The fan proper may be cleaned through an opening '0, made in the wall ofthe stack at the level of the fan and ordinarily cov ered by a suitabledoor.

Having described my invention I claim:

1. In combination with a vertical stack, a

' bottom for said stack provided with an opening which connects with anair supply and from which extends an upwardly directed air conduit, arotatable fan in said for said shaft provided with a neck and thrustbearing and located in the'space below the stack which is bounded by theinner Walls of the exit flues, there being an opening connecting saidstack and said space through which said shaft passes and through whichair may flow upwardly over the shaft.

In testimony whereof I have hereunto set my hand.

HEINRICH TOUSSAINT.

